Thanks for mentioning this here. We have also updated our instructions suggesting everyone installing the plugin does this:
On Google Cloud Console project “APIs & auth” -> “Consent screen” make sure you enter both a Product Name and and email address.
A handful of users have reported the ‘invalid client’ error message if they don’t do this – but it’s a good thing to do anyway, to make the site look more complete to their users.
So our instructions now suggest everyone completes this step – but it’s easy to miss if you’re going quickly, so great to have a note here too!
